/*
 * Copyright (c) 2012 Robert Burrell Donkin robertburrelldonkin.name
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
 * and associated documentation files (the "Software"), to deal in the Software without restriction, 
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or 
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */
package name.robertburrelldonkin.alfie;

import java.util.concurrent.CountDownLatch;

public abstract class Cog implements Runnable {

	private final CountDownLatch stopLatch = new CountDownLatch(1);

	protected abstract void doHook();

	private volatile boolean ready = true;
	private volatile boolean stop = false;

	public Cog() {
		super();
	}

	public final void run() {
		ready = false;
		try {
			while (!stop) {
				doHook();
			}
		} finally {
			stop = true;
			stopLatch.countDown();
		}
	}

	public final Cog finish() {
		stop = true;
		finishHook();
		return this;
	}
	
	protected void finishHook() {}

	public final Cog waitTillFinished() {
		try {
			stopLatch.await();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		return this;
	}

	public void start() {
		if (ready) {
			new Thread(this).start();
		}
	}
}